Supporting apparatus having a plurality of magnets that...

Electricity: motive power systems – Linear-movement motors

Reexamination Certificate

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C310S012060, C355S053000, C355S072000

Reexamination Certificate

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06954041

ABSTRACT:
Compatibility of a small spring constant and large supporting load is realized, so that a stable operation is assured even if a fine-movement linear motor fails. A supporting unit, having a plurality of magnets whose same poles are arranged facing each other, is adapted to support the self-weight of a top plate on which an object to be positioned is mounted, using a repulsive force in a direction orthogonal to the facing direction of the plurality of magnets. In a characteristic curve representing the relationship between the floating force and displacement in a floating direction, the tangent inclination when the object is at a first position in the floating direction is negative, and the relationship of floating force<the self-weight holds when the object is at a second position lower than the first position.

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European Search Report dated Jan. 18, 2005, issued in corresponding European patent appln. No. 03 25 2944, forwarded in a Communication dated Jan. 18, 2005.

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